The flue gas denitration circulating pump denitration technology is introduced

To prevent coal combustion in the boiler to produce the NOx pollution of the environment, too much to deal with coal denitration process, flue gas denitration circulating water pump of denitration technology at present is more, about the following: flue gas denitration, SCR denitration technology, dilute nitric acid absorption, alkaline solution absorption and so on, now we introduce a way.

1, the flue gas denitration

flue gas denitration refers to the NOX reduction for the generated N ₂, thus removing the NOX in flue gas, according to the governance process can be divided into denitration by wet method and dry denitration. Some researchers at home and abroad has also developed with microbial method to deal with NOX exhaust gas.

due to the NOx in flue gas emissions from the burning system, 90% above is NO, and NO poorly soluble in water, so the wet processing of NOx cannot use simple washing method.

principle of flue gas denitration is NO oxidation with oxidant into NO ₂, generated NO ₂ or alkaline solution with water absorption, so as to realize the denitration. O ₃ oxidation absorption into NO ₂ O ₃ will NO oxidation, and water absorption. Subject to the law's products HNO ₃ liquid enrichment processing, preparing and O3 need high voltage, high initial investment and operation cost.

ClO ₂ REDOX process ClO ₂ NO oxidation into NO ₂, then use Na ₂ SO ₃ aqueous solution will NO ₂ back into N ₂. The law can and using NaOH as desulfurizer wet desulphurization technology used in combination, the desulfurization reaction product Na ₂ SO ₃ and can be used as NO ₂ reductant. ClO ₂ method of denitration rate can reach 95%, and at the same time the desulfurization, clos ₂ and NaOH is higher, the price of the cost increase.

2, selective catalytic reduction denitration SCR denitration technology

method for selective catalytic reduction (SCR) be denitration in the presence of catalyst, using ammonia, CO and hydrocarbons as reducing agent, in the presence of oxygen to the NO reduction of a flue gas to N ₂. Can be used as a reductant SCR reaction of NH ₃, CO and H ₂ and methane, ethane, propane, propylene, etc. With ammonia as reducing gas to get the highest removal efficiency of NO. SCR is REDOX reaction, so follow the REDOX mechanism or Mars - van Krevelen- Type mechanism. At present, foreign scholars has been the SCR reaction of reactants is NO agreed, rather than NO ₂, and O ₂ participated in the reaction.

3, dilute nitric acid absorption because of NO and NO ₂ solubility in the nitric acid is much bigger than in the water, Such as NO solubility in the concentration of 12% nitric acid 12 times greater than in the water solubility) , dilute nitric acid absorption method is adopted to improve the NOX removal technology is widely used.

with the increase of nitric acid concentration, the absorption efficiency improved significantly, but consider industrial practical application and cost etc factors, nitrate concentrations generally used in practical operation control in the range of 15% ~ 20%. Dilute nitric acid absorption efficiency of NOX in addition to the associated with the concentration of itself, is also associated with absorption temperature and pressure, high pressure at low temperature is beneficial to the absorption of NOX.

4, alkaline solution absorption method is using NaOH, KOH, Na ₂ CO ₃, NH ₃ · H ₂ O alkaline solution as absorbent to chemical absorption of NOX, which ammonia ( NH₃·H₂O) The highest absorption rate. To further improve the absorption efficiency of NOX, and developed a two-stage alkali solution of ammonia absorption: first of all, ammonia and NOX and water vapour in gas phase reaction completely, produce ammonium nitrate white smoke.

then further absorbs unreacted NOX in alkaline solution. Generate the nitrate and nitrite, NH ₄ NO ₃, NH ₄ NO ₂ will dissolve in alkaline solution. After many cycles of absorbing liquid, depleted, lye solution containing a nitrate and nitrite concentration crystal, can be used as fertilizer.

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